Assembling polystyrenes spheres arrays in specified regions for required nanophotonic structures

We present an effective method to assemble the PSs in specified regions by hydrophiling the substrate in designed regions for the nanophotonics with nanostructures in well-definite regions. A hydrophilic positioning template which carries designed metal structures is prepared by lithography according to the specified requirement. Following that, the structured metal surface is treated to be hydrophobic by a 184 polydimethylsiloxane (PDMS) membrane. After self-assembly and metal lift-off process, the PSs can be assembled only in the well-defined pattern regions. The corresponding experiments were performed and PSs were assembled in the different shapes regions.

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► An effective method to assemble the PSs in specified regions was presented.
► Substrate was treated to be hydrophilic only in the designed regions by pattern protecting the outside regions.
► PSs were assembled in variety of shaped regions.
► The application field of self-assembly method was extends.